untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd 

: not treated

untreated wastewater

especially : not improved or controlled medically

an untreated case of pneumonia

untreated diabetic patients

Synonyms

• crude
• unprocessed
• natural
• raw
• native

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

Symptoms like irritability, impulsivity, memory loss and mood swings can overlap and worsen if left untreated. —Keita Franklin, New York Daily News, 4 Aug. 2025

If that inflammation is left untreated, FFA will always progress to hair loss, says Dr. Mirmirani. —Ashley Abramson, Allure, 4 Aug. 2025

If left untreated, the bacteria can spread to the joints, nervous system and heart. —Tiffany Acosta, AZCentral.com, 3 Aug. 2025

In addition to her dental issues, S'mores also tested positive for heartworm disease, a condition transmitted by mosquitoes that can be fatal if left untreated. —Melissa Fleur Afshar, MSNBC Newsweek, 1 Aug. 2025

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for untreated

• accreted
• competed
• completed
• conceited
• concreted
• defeated
• deleted
• depleted
• entreated
• intreated
• maltreated
• mistreated

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease